The proper Group-function has been eliminated during the transition from legacy Vienna MIR to MIR Pro, sorry to say so. VSL's software engineers are convinced that the "Selection Groups"-feature is a valid replacement (... I'm not).
"Selection Groups" allow for the simultaneous, relative change of a parameter for all selected Icons directly on a stage or in the Instrument Channel on the right. This can be either achieved by pressing the "Alt"-key while changing the value of a paramter with the mouse, or you can decide to make this the standard behaviour without the need of any additional modifier key (the option for that in MIR Pro's General Preferences: "Automatically edit selected channels as a group", respectively "Auto-group selected channels" in the plug-in version).
You _can't_ type in values for all Icons, though, and there's no way to have the same absolute value for all. It's not possible to exclude certain parameters from a temporary Selection Group - you have to un-select any Icon you want to remain at its curren value. This is highly unconvenient when working with Hidden Icons, and in general a major drawback when working with many Icons on a stage.
You can save, modify and recall different "Selection Groups" from the Main Menu or the right-click context menu in MIR Pro, but there is no shortcut to access these saved Groups - you have to use the mouse and find your way through the menu structure.
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A proper Group-function is needed desperately in MIR Pro, and you could strengthen this point-of-view by sending a feature request to support@vsl.co.at . ;-)
Kind regards,